I'm sorry, but as of my knowledge cutoff in early 2023, there is no well-known author by the name of Effie Campbell that I can provide information on. It is possible that the author may be a lesser-known or emerging writer, or there might be a mistake in the name provided. If you have any additional information or context about Effie Campbell, such as the titles of any books they have written or the genre they specialize in, I could attempt to provide more information based on that. Alternatively, if you are looking for information on a different author or a more widely recognized figure, please provide the correct details, and I'll be glad to help.